scheduler/sysdeps.c

   1 /*
   2  * System-dependent scheduler support
   3  *
   4  * Copyright 1998 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8
   9 /* Get pointers to the static errno and h_errno variables used by Xlib. This
  10    must be done before including <errno.h> makes the variables invisible.  */
  11 extern int errno;
  12 static int *perrno = &errno;
  13 extern int h_errno;
  14 static int *ph_errno = &h_errno;
  15
  16 #include <signal.h>
  17 #include <stdio.h>
  18 #include <unistd.h>
  19 #ifdef HAVE_SYS_SYSCALL_H
  20 # include <sys/syscall.h>
  21 #endif
  22 #ifdef HAVE_SYS_LWP_H
  23 # include <sys/lwp.h>
  24 #endif
  25 #ifdef HAVE_UCONTEXT_H
  26 # include <ucontext.h>
  27 #endif
  28 #include "wine/port.h"
  29 #include "thread.h"
  30 #include "selectors.h"
  31 #include "server.h"
  32 #include "winbase.h"
  33 #include "wine/exception.h"
  34 #include "debugtools.h"
  35
  36 DEFAULT_DEBUG_CHANNEL(thread)
  37
  38 /* Xlib critical section (FIXME: does not belong here) */
  39 CRITICAL_SECTION X11DRV_CritSection = { 0, };
  40
  41 #ifdef linux
  42 # ifdef HAVE_SCHED_H
  43 #  include <sched.h>
  44 # endif
  45 # ifndef CLONE_VM
  46 #  define CLONE_VM      0x00000100
  47 #  define CLONE_FS      0x00000200
  48 #  define CLONE_FILES   0x00000400
  49 #  define CLONE_SIGHAND 0x00000800
  50 #  define CLONE_PID     0x00001000
  51 # endif  /* CLONE_VM */
  52 # define PER_THREAD_FILE_HANDLES
  53 #endif  /* linux */
  54
  55 #ifdef HAVE_RFORK
  56 # define PER_THREAD_FILE_HANDLES
  57 #endif
  58
  59 static int init_done;
  60
  61 #ifndef NO_REENTRANT_LIBC
  62
  63 /***********************************************************************
  64  *           __errno_location/__error/___errno
  65  *
  66  * Get the per-thread errno location.
  67  */
  68 #ifdef HAVE__ERRNO_LOCATION
  69 int *__errno_location()
  70 #endif
  71 #ifdef HAVE__ERROR
  72 int *__error()
  73 #endif
  74 #ifdef HAVE___ERRNO
  75 int *___errno()
  76 #endif
  77 #ifdef HAVE__THR_ERRNO
  78 int *__thr_errno()
  79 #endif
  80 {
  81     if (!init_done) return perrno;
  82 #ifdef NO_REENTRANT_X11
  83     /* Use static libc errno while running in Xlib. */
  84     if (X11DRV_CritSection.OwningThread == GetCurrentThreadId())
  85         return perrno;
  86 #endif
  87     return &NtCurrentTeb()->thread_errno;
  88 }
  89
  90 /***********************************************************************
  91  *           __h_errno_location
  92  *
  93  * Get the per-thread h_errno location.
  94  */
  95 int *__h_errno_location()
  96 {
  97     if (!init_done) return ph_errno;
  98 #ifdef NO_REENTRANT_X11
  99     /* Use static libc h_errno while running in Xlib. */
 100     if (X11DRV_CritSection.OwningThread == GetCurrentThreadId())
 101         return ph_errno;
 102 #endif
 103     return &NtCurrentTeb()->thread_h_errno;
 104 }
 105
 106 #endif /* NO_REENTRANT_LIBC */
 107
 108 /***********************************************************************
 109  *           SYSDEPS_SetCurThread
 110  *
 111  * Make 'thread' the current thread.
 112  */
 113 void SYSDEPS_SetCurThread( TEB *teb )
 114 {
 115 #if defined(__i386__)
 116     /* On the i386, the current thread is in the %fs register */
 117     __set_fs( teb->teb_sel );
 118 #elif defined(HAVE__LWP_CREATE)
 119     /* On non-i386 Solaris, we use the LWP private pointer */
 120     _lwp_setprivate( teb );
 121 #endif
 122
 123     init_done = 1;  /* now we can use threading routines */
 124 }
 125
 126 /***********************************************************************
 127  *           SYSDEPS_StartThread
 128  *
 129  * Startup routine for a new thread.
 130  */
 131 static void SYSDEPS_StartThread( TEB *teb )
 132 {
 133     int parent_socket = -1;
 134 #ifdef PER_THREAD_FILE_HANDLES
 135     parent_socket = NtCurrentTeb()->socket;
 136 #endif
 137     SYSDEPS_SetCurThread( teb );
 138     if (parent_socket != -1) close( parent_socket );
 139     CLIENT_InitThread();
 140     SIGNAL_Init();
 141     __TRY
 142     {
 143         teb->startup();
 144     }
 145     __EXCEPT(UnhandledExceptionFilter)
 146     {
 147         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 148     }
 149     __ENDTRY
 150     SYSDEPS_ExitThread(0);  /* should never get here */
 151 }
 152
 153
 154 /***********************************************************************
 155  *           SYSDEPS_SpawnThread
 156  *
 157  * Start running a new thread.
 158  * Return -1 on error, 0 if OK.
 159  */
 160 int SYSDEPS_SpawnThread( TEB *teb )
 161 {
 162 #ifndef NO_REENTRANT_LIBC
 163
 164 #ifdef linux
 165     if (clone( (int (*)(void *))SYSDEPS_StartThread, teb->stack_top,
 166                CLONE_VM | CLONE_FS | SIGCHLD, teb ) < 0)
 167         return -1;
 168     close( teb->socket );  /* close the child socket in the parent */
 169     return 0;
 170 #endif
 171
 172 #ifdef HAVE_RFORK
 173     void **sp = (void **)teb->stack_top;
 174     *--sp = teb;
 175     *--sp = 0;
 176     *--sp = SYSDEPS_StartThread;
 177     __asm__ __volatile__(
 178     "pushl %2;\n\t"             /* RFPROC|RFMEM|RFFDG */
 179     "pushl $0;\n\t"             /* 0 ? */
 180     "movl %1,%%eax;\n\t"        /* SYS_rfork */
 181     ".byte 0x9a; .long 0; .word 7;\n\t" /* lcall 7:0... FreeBSD syscall */
 182     "cmpl $0, %%edx;\n\t"
 183     "je 1f;\n\t"
 184     "movl %0,%%esp;\n\t"        /* child -> new thread */
 185     "ret;\n"
 186     "1:\n\t"            /* parent -> caller thread */
 187     "addl $8,%%esp" :
 188     : "r" (sp), "g" (SYS_rfork), "g" (RFPROC|RFMEM|RFFDG)
 189     : "eax", "edx");
 190     close( teb->socket );  /* close the child socket in the parent */
 191     return 0;
 192 #endif
 193
 194 #ifdef HAVE__LWP_CREATE
 195     ucontext_t context;
 196     _lwp_makecontext( &context, (void(*)(void *))SYSDEPS_StartThread, teb,
 197                       NULL, teb->stack_base, (char *)teb->stack_top - (char *)teb->stack_base );
 198     if ( _lwp_create( &context, 0, NULL ) )
 199         return -1;
 200     return 0;
 201 #endif
 202
 203 #endif /* NO_REENTRANT_LIBC */
 204
 205     FIXME("CreateThread: stub\n" );
 206     return 0;
 207 }
 208
 209
 210
 211 /***********************************************************************
 212  *           SYSDEPS_ExitThread
 213  *
 214  * Exit a running thread; must not return.
 215  */
 216 void SYSDEPS_ExitThread( int status )
 217 {
 218 #ifndef PER_THREAD_FILE_HANDLES
 219     /* otherwise it will be closed automagically by _exit */
 220     close( NtCurrentTeb()->socket );
 221 #endif
 222 #ifdef HAVE__LWP_CREATE
 223     _lwp_exit();
 224 #endif
 225     _exit( status );
 226     /*
 227      * It is of course impossible to come here,
 228      * but it eliminates a compiler warning.
 229      */
 230     exit( status );
 231 }
 232
 233
 234 /**********************************************************************
 235  *           NtCurrentTeb   (NTDLL.89)
 236  *
 237  * This will crash and burn if called before threading is initialized
 238  */
 239 #ifdef __i386__
 240 __ASM_GLOBAL_FUNC( NtCurrentTeb, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" );
 241 #elif defined(HAVE__LWP_CREATE)
 242 struct _TEB * WINAPI NtCurrentTeb(void)
 243 {
 244     extern void *_lwp_getprivate(void);
 245     return (struct _TEB *)_lwp_getprivate();
 246 }
 247 #else
 248 # error NtCurrentTeb not defined for this architecture
 249 #endif  /* __i386__ */